Questions & Answers about Dziś wieczorem chcę odpocząć w domu.
Because Polish often drops subject pronouns when they are clear from the verb form.
- chcę = I want
- So ja is not necessary
You could say Ja dziś wieczorem chcę odpocząć w domu, but that sounds more emphatic, as if you are stressing I.
Both mean today.
- dziś is a little shorter and slightly more compact in style
- dzisiaj is also completely normal and very common
So these are both fine:
- Dziś wieczorem chcę odpocząć w domu.
- Dzisiaj wieczorem chcę odpocząć w domu.
For a learner, it is safest to treat them as near-equivalents in everyday speech.